This changes the sprites of the fist so that the player punches with this right hand. Not only is it awkward looking when we're used to the doomguy being ambidextrous, it looks strange when we see the player actually try to punch things rather than punch all half-ass like with his left hand. Strangely, it does not change the pistol in being wielded with the right hand. Probably makes more sense that the crappy aim is because he's holding it with his left hand.